Mini RTC Module for Raspberry Pi
Sale price £5
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This is a Mini Real-Time Clock module designed for the Raspberry Pi. It can also be with an Arduino board too!
This accessory plugs on top of your Pi's GPIO pins and contains a clock chip and a tiny CR927 lithium battery that allows your Raspberry Pi to remember the time.
The module uses a DS3231 chip which can be coded to have an alarm function (you can see some discussions on this here and here, and there are plenty more on the internet too)